Route 41 was an express bus route operated by King County Metro in Seattle, Washington, United States. It connected Lake City and Northgate to Downtown Seattle, with non-stop service on Interstate 5 south of Northgate Transit Center. The route was created in 1970 by the city-run Seattle Transit System as the 41 Blue Streak, the first in a series of express bus services in North Seattle using the Interstate 5 express lanes. It was transferred to Metro in 1973 and dropped the "Blue Streak" branding in 1978. Route 41 was moved to the downtown transit tunnel in 1991, and expanded into an all-day route in 2002. It has since become one of the busiest routes operated by King County Metro, with over 10,000 daily riders. The service was moved out of the downtown tunnel in 2019 and was retired on October 2, 2021, with the opening of Link light rail service to Northgate. (en)